deleted by creator

Kopia might meet your needs.

https://kopia.io/

(Edit, because I’ve got more time :)

• Runs native on Windows and macOS. Doesn’t need Windows WSL or a wrapper
• Can run as client-server, or standalone, backing up to local, network, S3, WebDAV, various clouds, etc
• Open source
• Snapshots are incremental, encrypted, and deduplicated
• CLI and GUI

I’ve been happily using it for years for similar needs (mixed systems)

Syncthing has multiple file versioning strategies.

https://docs.syncthing.net/users/versioning.html

So it can provide quite solid protection beyond a trash can, but yes, it’s still primarily a syncing tool.